Prison Term Weighed for Crime Lab's Ex-Chemist

BOSTON—Massachusetts prosecutors are seeking a prison sentence of up to seven years for a former state crime-lab chemist who was charged with tampering with test results in a case that sent shockwaves through the local criminal-justice system.

An attorney for defendant Annie Dookhan asked for leniency in a court hearing Friday, recommending one year in prison. He said the ex-state chemist is "a shell of her former self" and has suffered significantly from her alleged actions. Ms. Dookhan has pleaded not guilty to...